[ovirt-users] Is compatibility level change required for upgrading from 4.0 to 4.2?

[Arik Hadas]

On Fri, Apr 6, 2018 at 12:28 PM, Luca 'remix_tj' Lorenzetto <
lorenzetto.luca at gmail.com> wrote:

> On Fri, Apr 6, 2018 at 11:05 AM, Michal Skrivanek
> <michal.skrivanek at redhat.com> wrote:
> >
> > you just need to keep the supported versions in mind. Version 4.2
> supports
> > Cluster levels 3.6, 4.0, 4.1(same as version 4.1) - so any of them is ok
> >
>
> Perfect, thank you for the confirmation.
>
> To change the compatibility level of DC, i've seen that all clusters
> require has to be upgraded.
> Does the upgrade of the DC requires the restart of all the VMs to have
> the cluster completely upgraded or restarting the VMs is an activity
> indipendent from this?
>

You won't have to restart the running VMs.
You'll see that VMs that were running at the time of the cluster upgrade
are set with custom-compatibility-version that matches the previous
compatibilty-level of the cluster. So obviously, VM-specific features that
were added in 4.2 won't be applicable to those VMs until they are restarted
(and then their custom-compatibility version is cleared so their effective
compability-level would change to 4.2).
But even when some VMs are set with custom-compatibility-version, the
cluster is upgraded and so it should be possible to upgrade the DC.


>
> Luca
>
>
>
> --
> "E' assurdo impiegare gli uomini di intelligenza eccellente per fare
> calcoli che potrebbero essere affidati a chiunque se si usassero delle
> macchine"
> Gottfried Wilhelm von Leibnitz, Filosofo e Matematico (1646-1716)
>
> "Internet è la più grande biblioteca del mondo.
> Ma il problema è che i libri sono tutti sparsi sul pavimento"
> John Allen Paulos, Matematico (1945-vivente)
>
> Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , <
> lorenzetto.luca at gmail.com>
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